Furnace-door.



No. 8S,067'. v PATENTED JUNE 9, 1908.

` G. G. Y. KING.

PURNAGE DooP..l APPLICATION FILED JAN. 15. 1904.

Vand showing the application IINITI "STA i S CHARLES Cr. Y. KING, OF CHICAGO, ILLINOIS@ FURNACE-DOOR.

Specification of Letters Patent.

Patented June 9, 1908.

Application filed. January 15, 1904. Serial No. 189,140.

To all whom it may concern:

Be it known that I, CHARLES G. Y. KING, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Furnace-Door, of which the following is a speciiication. l

This invention relates to furnace doors.

The object of the invention is to provide a door for furnaces, fire boxes, smelters, ranges, or the like, which is simple in construction and eliicient, and wherein the door casting is prevented from becoming over-heated, and wherein the lire brick or tile lining of the inside of the door is readily removable for repair or replacement.

Other objects of the invention will appear more fully hereinafter.

The invention consists substantially in the construction, combination, location and arrangement of parts, all as will be more fully hereinafter set forth, as shown in the accompanying drawing, and iinally `pointed out in the appended claims.

Referring to the accompanying drawing, and to the various views and reference signs appearing tl1ereon,-F igure 1 is a view in elevation of the inside surface of a lire or furnace door embodying the principles of my invention, the fire brick or tile lining being re moved. Fig. 2 is a'view in transverse section, the plane of section being indicated by the line 2, 2, Fig. 1, looking in the direction of the arrows, of a fire door constructed in ac cordance with the principles of my invention, thereof to a boiler or fire box front, parts of the latter being broken oli". Fig. 3 is a view in section on the line 3, 3, Fig. 2, looking in the direction of the arrows.

'lhe same part is designated by the same reference sign wherever it occurs throughout l the several views.

I-Ieretofor'e in the construction, use and operation of doors for re boxes, steam or other boilers, dry-kilns, smelters, ranges and theA like, difliculty has been experienced in providing against the over-heating of the door casting, and in repairing, replacing or renewing the fire brick or tile lining on the inside surface of the door.

It is among the special purposes of my present invention to provide a door adapted for use as a door for steam or other boilers, furnaces, smelters, dry-kilns, 'fire boxes and the like, in which the iire brick or tile lining on the inside surfacel of the door, while being efliciently supported upon the door casting,

adapting it to close or cover the opening of the iire box, furnace, smelter or the like, and having adjacent to each side edge thereof a projecting dovetail-shaped rib B, C, on the inner face thereof. I also provide the door casting A with a central rib or projection D, preferably of dovetail shape, as indicated in the drawing, the side edges of which cooperate respectively with the dovetail-shaped ribs or projections B, C, tov form dovetail guideways.

E designates the tiling or 'fire brick lining to be applied tothe inner face of the door casting. In practice I prefer to make these tiles or bricks in sections, and to form each section with corresponding dovetail-shaped portions F arranged to be received in the dovetail guideways formed by the ribs or projections B, C, and the cooperating and corresponding side edges of the rib or projection D, as clearly shown in the drawing. Frein the foregoing description it will be readily seen that the sections of tile or fire brick may be readily applied to or removed from the door casting by slipping the same, or the dovetail-shaped portions F thereof, into or out of the guideways formed by the ribs B and C and the cooperating rib D. It is obvious that these dovetail guideways may be arranged either vertically with referenc-'e to the door casting, and in parallel relation with respect to each other, as shown in the drawing, or transversely and horizontally across the inside surface of the door casting, without departure from the spirit of my invention, in which latter event the fire brick sections would be slipped into the guideways `horizontally instead of vertically. In order to aord an efficient support for the iire brick sections, I provide the door casting,

rick section, as clearly shown in Figs. l and j 3. This rib G should be of sufficient length-VA to afford a support for the fire brick sections on both sides of the central dovetail rib D, as shown. Preferably, both the extreme upper and lower sections of fire brick are provided with the seats or recesses indicated at H, Fig. 3, whereby said sections are made reversible or interchangeable. From this construction it will be seen that in case some of the Ylire brick sections become burned more than others their-places may be interchanged whenever desired,- thereby greatly increasing the life of the door. Of course it will be understood that where the securing ribs B, C and D extend horizontally, that is, if the door as seen in Fig. 1 were turned onequarter of a revolution edgewise, the ribs or projections B, C and D would in themselves afford a support for the 'lire brick sections, thereby dispensing with the necessity f'or the rib G. In order to form a bearing support for the fire bricks or tiles against the door casting at points intermediate the dovetail guiding and securing ribs B, D, or C, D, I

may, if desired, provide the door casting A with projecting ribs J arranged to extend in parallel relation with respect to the ribs B, C and D, and against which the fire bricks or tiles rest or bear. Vhile I have shown one of the bearing projections J between each of the side ribs B, C, and the central rib D, it is obvious that as many of such ribs may be provided as may be desired.

I have above indicated that the fire bricks or tiles E may be made sectional. I have shown this lire brick or tile lining of the door formed in four sections, two sections bein accommodated on each side of the centra rib D of the door casting. I do not desire, however, to be limited in respect of the number of sections into which the fire brick or tile lining may be formed.

If desired, and in order to decrease the weight of the door casting, the central'rib or projection D may be cored out as indicated at K.

While I have described the door as being formed with two dovetail guideways, one formed between the rib B and the central rib D, and the other formed by the rib C and the central rib D, it is obvious that as many such n guideways may be provided as desirable, by

` in this respect.

providing the door casting with as many pairs of cooperating dovetail-shaped ribs or projections as may be necessary. do not desire, therefore, to be limited or restricted The size of the door would in large measure determine the number of dovetail-shaped guideways. In case of very small doors, it is obvious that the central dovetail-shaped rib D may be omitted, the fire bricks or tiles being of suflicient length to extend from the edge rib B to the opposite edge rib C. l

In order to prevent the door casting from becoming overheated, it is desirable to provide means for efficiently Ventilating and maintaining said casting cooled. Thisv result may be accomplished in many specific- 1,1

ally different ways. I have shown one arrangement in Figs. 2 and 3, wherein I provide the door casting A, upon the outer side or surface thereof, with a series of projecting plates or hns L arranged to extend vertically place these fins or flanges as close together as practicable, the larger their number the better, as thereby a larger area of cooling surface is presented to the draft of air created therebetween, thereby enabling me to maintain the door casting sufliciently cool to prevent injury thereto by reason of over-heating.

It is obvious that a door constructed in accordance with the principles of my invention may either be -a sliding or a hinged or swinging door. The door is hinged, as indicated at P, so as to swing into bearing relation with respect to the frame Q of the boiler setting to form a closure for the opening into the firebox, furnace or the like. To this end the door casting A is provided with a rim or edge R arranged to bear against the adjacent surface of the furnace frame or setting.

While I have described guideways which receive the projecting portions F of the fire bricks or tiles, as being dovetailed, it is obvious that any other shape may be provided, so long as a guideway is afforded, and

the construction is such that the fire brick y sections or tiles are independently and removably secured to the inside surface of the door casting.

It will be observed that the fire brick or tile lining on the inside surface of the door is somewhat offset from the door, thereby leaving a space S between the surface of the fire brick or tiling and the adjacent surface of the door casting. This space may be yutilized as a dead-air space to prevent radiation or conduction of heat to the door casting, or if den sired said space may be filled with any suitable non heat conducting material, such, for instance, as asbestos, or the like, -thereby still further insuring against over-heating of thedoor casting.

It is obvious that a door constructed 'in accordance with my invention is well adapted for use in any form of steam or other boiler, furnace, dry-kilns, lire boxes, or the like, where it is important to efficiently protect the door against the heat of the furnace chamber, fire box or the like.

It is obvious that many variations and changes in the details of construction and arrangement would readily occur to persons skilled in the art and still fall within the spirit and scope of my invention. I do not desire, therefore, to be limited or restricted to the exact details of construction and arrangement shown and described. But

Having now set forth the object and nature of my invention, and constructions embodying the principles thereof, and having described such constructions, their purpose, function and mode of operation, what I claim as new and useful and of my own invention, and desire to secure by Letters Patent, is:

l. In a furnace door, a door casting, a fire brick or tile lining for the inner surface thereof, and means for detachably mounting said lining upon said door casting, said door castingl having lugs upon the inner surface thereof to offset the fire brick or tile lining from contact with such inner surface, said door casting having parallel fins or flanges projecting vertically across the outer face there- 1 of, all combined and arranged as and for the purpose set forth.

2. In a furnace door, a door casting, a lining for the inner surface of said casting, means for offsetting said lining from contact with the inner surface of the casting to form a space therebetween, and means arranged on the outer surface of the door casting for dissipating the heat of said casting.

3. In a lining for the inner surface of said casting and means for offsetting said lining from contact with the inner surface of said casting, said casting having vertically arranged suitably spaced ribs or fins on the outer surface thereof to form channels whereby the casting is prevented from overheating.

4. In a furnace door, a casting having lugs on the inner surface thereof and vertically arranged parallel fins on the outer surface thereof, in combination with a lining for the inner surface of the casting, said lugs serving to off-set said lining from contact with the inner surface of the door.

In witness whereof, I' have hereunto set my hand this 12th day of January 1904, in the presence of the subscribing witnesses.

CHARLES G. Y. KING.

Witnesses:

CHAs. II. SEEM, S. E. DARBY furnace door, a door casting, a 

